:root{--green:#f5f2ef;--green-dark:#f5f2ef;--mint:#1a1b1d;--ink:#f5f2ef;--muted:#a9abb0;--paper:#1a1b1d;--line:#1a1b1d;--orange:#a9abb0;--white:#fff;--radius:16px}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;font-size:15px;line-height:1.6}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button,a{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit}button:disabled{cursor:default;opacity:.55}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #a9abb0;outline-offset:4px}h1,h2,h3,h4{font-family:Arial,Helvetica,sans-serif;line-height:1.24;margin:0;font-weight:750}h1{font-size:36px;letter-spacing:-1.5px}h2{font-size:24px;letter-spacing:-.6px}h3{font-size:17px;letter-spacing:-.3px}p{margin:0 0 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#a9abb0;position:relative;transform:rotate(-15deg)}.orbital:before,.orbital:after{content:'';position:absolute;border:1px solid #a9abb0;border-radius:50%;inset:22px}.orbital:after{inset:44px}.orbit-dot{position:absolute;width:12px;height:12px;background:#303337;border-radius:50%;top:17px;right:26px}.art-card{position:absolute;background:#1a1b1d;color:#f5f2ef;box-shadow:0 16px 30px #0d2a2b22;border-radius:11px;padding:16px 21px;transform:rotate(-7deg);width:160px;left:31px;top:37px}.art-card .mini-line{height:5px;background:#1a1b1d;border-radius:3px;margin:10px 0;width:90%}.art-card .mini-line.short{width:60%}.art-card .check-dot{background:#1a1b1d;border-radius:50%;display:grid;place-items:center;width:28px;height:28px}.art-badge{position:absolute;background:#303337;color:#f5f2ef;border:4px solid var(--green);border-radius:12px;right:3px;bottom:12px;transform:rotate(7deg);font-family:Arial,Helvetica,sans-serif;font-size:13px;padding:13px 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a{text-decoration:none;flex:1}.lesson-row h3{font-size:14px;margin:0 0 4px}.lesson-row p{font-size:11px;color:var(--muted);margin:0}.icon-button{border:1px solid var(--line);background:var(--card);border-radius:7px;min-width:34px;min-height:34px;color:#a9abb0}.icon-button.bookmarked{color:#f5f2ef;background:#1a1b1d}.empty-state{text-align:center;padding:50px 25px;color:var(--muted)}.empty-state h2{margin-bottom:10px;color:var(--ink)}.two-col{display:grid;grid-template-columns:1fr 280px;gap:24px}.lesson-body h2{font-size:21px;margin:29px 0 13px}.lesson-body h2:first-child{margin-top:0}.lesson-body p{font-size:15px;line-height:1.85}.example{background:#1a1b1d;border-left:3px solid #a9abb0;padding:22px;border-radius:0 10px 10px 0}.example .eyebrow{color:#a9abb0;margin-bottom:10px}.example p{margin:0}.pitfall{background:#1a1b1d;border:1px solid #1a1b1d;padding:19px;border-radius:10px;font-size:13px;line-height:1.7;margin-top:22px}.pitfall strong{display:block;color:#a9abb0;margin-bottom:5px}.lesson-aside{align-self:start;position:sticky;top:20px}.lesson-aside h3{margin-bottom:13px}.lesson-aside p{font-size:12px;color:var(--muted)}.lesson-aside .btn{width:100%;margin:6px 0}.meta-list{display:grid;gap:13px;margin:20px 0;font-size:12px}.meta-list div{display:flex;justify-content:space-between}.back-link{font-size:12px;text-decoration:none;display:inline-block;margin-bottom:20px;color:var(--muted)}.lesson-nav{display:flex;justify-content:space-between;gap:15px;margin-top:25px}.lesson-nav a{font-size:12px;color:var(--green);text-decoration:none}.practice-layout{display:grid;grid-template-columns:1.5fr 1fr;gap:24px;margin-top:27px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:19px}.field{display:flex;flex-direction:column;gap:7px}.field label,.field-label{font-size:12px;font-weight:650}.form-span{grid-column:1/-1}.mode-options{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.mode-card{display:flex;flex-direction:column;gap:8px;border:1px solid var(--line);background:var(--card);padding:17px 12px;border-radius:9px;font-size:12px;text-align:left;color:var(--ink)}.mode-card.active{background:#1a1b1d;border-color:#a9abb0;box-shadow:inset 0 0 0 1px #a9abb0}.mode-card small{font-size:10px;color:var(--muted)}.practice-notes{background:#1a1b1d}.practice-notes h3{font-size:18px;margin-bottom:19px}.numbered-note{display:flex;gap:13px;margin:19px 0}.numbered-note span{flex-shrink:0;border-radius:50%;border:1px solid #303337;width:25px;height:25px;display:grid;place-items:center;font-size:11px}.numbered-note p{font-size:12px;line-height:1.7;margin:0;color:#a9abb0}.numbered-note strong{display:block;color:var(--ink);margin-bottom:3px}.session-container{max-width:850px;margin:auto}.session-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;font-size:12px;color:var(--muted)}.session-progress{margin-bottom:25px}.question-header{display:flex;align-items:center;gap:10px;font-size:11px;color:var(--muted);margin-bottom:20px}.question-title{font-size:23px;line-height:1.6;margin-bottom:25px}.answers{display:grid;gap:11px}.answer{display:flex;align-items:center;gap:13px;width:100%;padding:16px;border:1px solid var(--line);border-radius:10px;background:var(--card);text-align:left;color:var(--ink);font-size:14px}.answer:hover:not(:disabled){background:#1a1b1d;border-color:#a9abb0}.answer.selected{border-color:var(--green);background:#1a1b1d}.answer.correct{background:#1a1b1d;border-color:#a9abb0;opacity:1}.answer.wrong{background:#1a1b1d;border-color:#a9abb0;opacity:1}.answer-letter{border:1px solid #1a1b1d;border-radius:6px;width:28px;height:28px;display:grid;place-items:center;flex-shrink:0;font-size:12px;font-weight:650}.feedback{margin-top:22px;padding:22px;border-radius:10px;background:#1a1b1d}.feedback.incorrect{background:#1a1b1d}.feedback h3{margin-bottom:10px}.feedback p{font-size:14px;line-height:1.8}.feedback ul{font-size:13px;padding-left:20px;line-height:1.9}.question-actions{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-top:25px}.self-score{border-top:1px solid #1a1b1d;padding-top:18px;margin-top:18px}.self-score p{font-size:12px;margin-bottom:12px}.self-buttons{display:flex;gap:10px;flex-wrap:wrap}.muted{color:var(--muted)}.summary-banner{text-align:center;background:var(--green);color:#fff;padding:35px;border-radius:16px;margin-bottom:22px}.summary-banner .eyebrow{color:#303337;margin-bottom:10px}.summary-banner p{color:#1a1b1d;margin-top:10px;margin-bottom:0}.score-number{font-size:58px;letter-spacing:-2px;font-weight:750;font-family:Arial,Helvetica,sans-serif;line-height:1.2;margin:15px 0}.score-caption{font-size:12px}.result-item{padding:20px;background:var(--card);border:1px solid var(--line);border-radius:10px;margin:12px 0}.result-item summary{cursor:pointer;font-size:14px;font-weight:600;line-height:1.6}.result-item p{font-size:13px;margin-top:16px;white-space:pre-wrap}.tag{font-size:10px;border-radius:4px;padding:3px 6px;background:#1a1b1d;display:inline-block;margin-right:8px}.tag.bad{background:#1a1b1d;color:#a9abb0}.tag.neutral{background:#1a1b1d;color:#a9abb0}.flashcard{max-width:750px;min-height:330px;margin:22px auto;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:38px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;box-shadow:0 10px 30px #203c3507}.flashcard h2{font-size:28px;margin:17px 0}.flashcard p{max-width:600px;font-size:15px;line-height:1.85;margin:14px 0}.flashcard .btn{margin-top:15px}.flash-controls{display:flex;align-items:center;justify-content:space-between;max-width:750px;margin:auto;gap:15px}.flash-controls span{font-size:12px;color:var(--muted)}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:12px}th{text-align:left;color:var(--muted);font-weight:500;padding:13px;border-bottom:1px solid var(--line)}td{padding:16px 13px;border-bottom:1px solid var(--line)}.resources-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:27px}.resources-grid h3{margin-bottom:13px}.resources-grid p,.resources-grid li{font-size:13px;line-height:1.9;color:var(--muted)}.resources-grid ul{padding-left:18px}.resource-link{display:block;border-top:1px solid var(--line);padding:13px 0;font-size:13px;text-decoration:none;color:var(--green)}.resource-link span{float:right}.notice{font-size:12px;line-height:1.7;color:var(--muted);background:#1a1b1d;padding:14px 17px;border-radius:8px;margin-top:17px}.danger{color:#a9abb0}.mobile-toggle{display:none}.skip-link{position:fixed;left:15px;top:-60px;z-index:100;background:var(--card);padding:10px}.skip-link:focus{top:10px}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%) translateY(30px);background:var(--green-dark);color:white;border-radius:10px;padding:12px 22px;box-shadow:0 8px 20px #f5f2ef20;opacity:0;pointer-events:none;transition:.2s;z-index:100;font-size:13px}#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}.storage-warning{padding:12px;background:#1a1b1d;font-size:12px;border-radius:8px;margin-bottom:20px}.search-count{font-size:12px;color:var(--muted);margin-bottom:14px}.actions-row{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.check-label{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted)}.check-label input{accent-color:var(--green)}
@media(min-width:1500px){main{padding-top:46px}.hero{min-height:270px}.domain-card{min-height:235px}}
@media(max-width:1150px){.sidebar{width:205px;padding:30px 17px}.workspace{margin-left:205px;width:calc(100% - 205px)}main{padding:30px}.topbar{padding:0 30px}.hero{padding:28px}.hero-art{flex-basis:190px}.art-card{left:7px}.art-badge{right:-15px}.domain-grid{gap:12px}.domain-card{padding:18px 15px}.stat{padding:15px}.two-col{grid-template-columns:1fr 240px}.practice-layout{grid-template-columns:1fr}.practice-notes{display:none}}
@media(max-width:900px){.domain-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-art{display:none}.hero-copy{max-width:100%}.hero h2{max-width:100%}.stats{grid-template-columns:repeat(2,1fr)}.two-col{grid-template-columns:1fr}.lesson-aside{position:static}.resources-grid{grid-template-columns:1fr}.quiet-pill{display:none}.topbar-link{font-size:11px}h1{font-size:30px}.heading-row{align-items:flex-start}footer{flex-direction:column;gap:4px;padding:20px 30px}}
@media(max-width:650px){.sidebar{transform:translateX(-100%);width:235px;box-shadow:10px 0 30px #203c3515;transition:transform .2s}.sidebar.open{transform:translateX(0)}.workspace{margin-left:0;width:100%}.mobile-toggle{display:block;margin-right:12px}.topbar{height:64px;padding:0 20px;justify-content:flex-start}.topbar-link{margin-left:auto}.topbar #breadcrumb{font-size:11px}.topbar-link span{display:none}main{padding:27px 20px}.heading-row{gap:12px;margin-bottom:22px}h1{font-size:28px;letter-spacing:-1px}.heading-row p{font-size:12px}.hero{padding:26px 24px;min-height:260px}.hero h2{font-size:28px}.hero p{font-size:12px}.hero-actions{gap:13px}.stats{gap:10px;margin:17px 0 27px}.stat{padding:14px 15px}.stat-value{font-size:25px}.domain-grid{grid-template-columns:1fr}.domain-card{min-height:190px;padding:20px}.card-top{margin-bottom:12px}.domain-card h3{max-width:100%;font-size:16px}.domain-card .card-desc{font-size:12px}.section-head h2{font-size:20px}.section-head .inline-link{font-size:11px}.panel{padding:22px 18px}.toolbar{gap:8px}.toolbar select{flex:1;min-width:150px}.lesson-row{padding:13px 12px;gap:10px}.lesson-row h3{font-size:13px}.lesson-row p{font-size:10px}.task-id{font-size:10px}.question-title{font-size:19px}.question-header{flex-wrap:wrap}.answer{padding:13px;font-size:13px}.form-grid{grid-template-columns:1fr}.mode-options{gap:6px}.mode-card{padding:13px 9px;font-size:11px}.mode-card small{font-size:9px}.question-actions{flex-wrap:wrap}.flashcard{padding:25px;min-height:350px}.flashcard h2{font-size:23px}.flashcard p{font-size:13px}.flash-controls .btn{padding:11px 13px}.summary-banner{padding:28px 20px}.self-buttons .btn{padding:11px 14px}.study-tip{padding:18px}.lesson-nav{flex-direction:column}.heading-row .btn{padding:10px 13px;font-size:11px;flex-shrink:0}.table-wrap{margin:0 -7px}.resources-grid{gap:14px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media(max-width:650px){.sidebar{visibility:hidden}.sidebar.open{visibility:visible}}
.weight,.domain-card .card-desc,.card-meta,.stat small,footer,.tiny-label,.local-note{color:#a9abb0}input::placeholder,textarea::placeholder{color:#a9abb0}

.lesson-sources{margin-top:28px;padding-top:20px;border-top:1px solid var(--line,#1a1b1d)}
.lesson-sources ul{padding-left:20px;line-height:1.6}.lesson-sources li{margin:10px 0;overflow-wrap:anywhere}.lesson-sources a{text-decoration:underline;text-underline-offset:3px}

.application-case{max-width:940px}.application-case h2{font-size:21px;line-height:1.6;margin-bottom:24px}.application-case li{line-height:1.65;margin:10px 0}.application-case a{overflow-wrap:anywhere}.application-graph{margin:24px 0;background:#1a1b1d;border:1px solid #1a1b1d;border-radius:14px;padding:18px}.application-graph svg{width:100%;height:auto}.application-graph details{margin-top:12px}.graph-legend{display:flex;gap:18px;flex-wrap:wrap;font-size:14px}.application-case .feedback{margin-top:24px}.application-case .answers{margin:20px 0}

/* NextBranch family theme, derived from Coverage Board and Display. */
:root{color-scheme:dark;--green:#a6323b;--green-dark:#75232a;--mint:#292023;--ink:#f5f2ef;--muted:#a9abb0;--paper:#101113;--line:#303134;--orange:#e99a75;--white:#1a1b1d;--card:#1a1b1d;--radius:10px;--link:#ff9297}
.sidebar{background:#18191b;overflow-y:auto}.topbar{background:#18191b}.brand{font-size:15px;letter-spacing:1.8px;display:block;line-height:1.45;white-space:nowrap}.brand em{font-style:normal;color:#ee6a70}.brand-sub{font-size:8px;letter-spacing:1.4px;white-space:normal;color:var(--muted);font-weight:400;line-height:1.6}.edition{padding-left:0;margin-top:26px}.nav-link{color:#b8bac0}.nav-link:hover{background:#242629}.nav-link.active{background:#342024;color:#ffb5b8;box-shadow:inset 3px 0 #d3484e}.sidebar-bottom{padding:28px 5px 0}.sidebar-bottom p{font-size:16px}.status-dot{background:#88bc9f}.hero{background:linear-gradient(115deg,#271c20,#1a1b1d 70%);border:1px solid #543036;border-left:4px solid #d3484e}.hero .eyebrow{color:#ff9297}.hero p,.hero .text-btn,.summary-banner p,.summary-banner .eyebrow{color:#c8c5c4}.hero h2{font-size:34px}.hero-art{opacity:.9}.orbital,.orbital:before,.orbital:after{border-color:#523238}.orbit-dot{background:#e84247}.art-card{background:#242629;color:#f5f2ef;border:1px solid #45474b;box-shadow:none;transform:none}.art-card .mini-line{background:#45474b}.art-card .check-dot{background:#4b252b;color:#ffb5b8}.art-badge{background:#a6323b;color:#fff;border-color:#1a1b1d;transform:none}.btn{background:#a6323b;color:#fff;min-height:44px}.btn:hover{background:#bd3b44}.btn.light{background:#f4f2ef;color:#19191b}.btn.secondary,.btn.ghost{background:#222427;color:#f5f2ef;border:1px solid #45474b}.btn.secondary:hover,.btn.ghost:hover{background:#303337}.btn.text-btn{background:transparent}.inline-link,.resource-link,.lesson-nav a{color:var(--link)}.panel,.stat,.domain-card,.flashcard,.summary-banner{border-radius:10px}.domain-card:hover{border-color:#a6323b;box-shadow:none}.domain-letter{background:#342024;color:#ffb5b8;border-radius:7px}.progress-track{background:#34363a}.progress-fill{background:#d3484e}.study-tip,.notice,.practice-notes{background:#1d2023;border-color:#303337}.study-tip p,.numbered-note p{color:#b8bac0}.numbered-note span{border-color:#55585e}.task-id{background:#342024;color:#ffb5b8}.example{background:#1d2524;border-color:#83b9a7}.example .eyebrow{color:#a6d1c2}.pitfall,.storage-warning{background:#30251d;border-color:#66513d}.pitfall strong{color:#efbe90}.icon-button{color:#c5c6ca;min-width:40px;min-height:40px}.icon-button.bookmarked{background:#3e3020;color:#f4c47a}.mode-card.active,.answer.selected{background:#342024;border-color:#d3484e;box-shadow:none}.answer:hover:not(:disabled){background:#27292d;border-color:#81858c}.answer.correct{background:#1c332a;border-color:#89bf9c}.answer.wrong{background:#3a2225;border-color:#ed858b}.feedback{background:#1c332a}.feedback.incorrect{background:#3a2225}.answer-letter{border-color:#62666c}.tag{background:#29332c;color:#bfd5c4}.tag.bad{background:#42282b;color:#ffc0c3}.tag.neutral{background:#303337;color:#ddd}.danger{color:#ff9297}.summary-banner{background:#292023}.quiet-pill{color:#bbb}.quiet-pill span{color:#88bc9f}.check-label input{accent-color:#d3484e}.application-graph{background:#f4f2ef;color:#243c35;border-color:#53565c;border-radius:10px}.application-graph svg{fill:#243c35}.skip-link{color:#fff;background:#a6323b}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline-color:#ff9297}input,select,textarea{border-color:#55585e;background:#16181b}input::placeholder,textarea::placeholder{color:#a9abb0}footer,.weight,.card-meta,.domain-card .card-desc,.stat small,.tiny-label,.local-note{color:#a9abb0}.search-wrap{min-width:min(220px,100%)}.lesson-row a{min-width:0}.lesson-row h3{overflow-wrap:anywhere}.heading-row{flex-wrap:wrap}.section-head{flex-wrap:wrap}.application-graph{margin-left:0;margin-right:0}.sidebar-bottom{flex-shrink:0}main{overflow-wrap:break-word}
@media(max-width:650px){.hero h2{font-size:28px}.sidebar{width:255px;padding-top:22px;padding-bottom:20px}.sidebar nav{gap:2px}.sidebar .nav-link{padding:9px 14px}.sidebar-bottom p{margin:8px 0}.sidebar-bottom{padding-top:18px}.topbar{gap:8px;padding:0 16px}.topbar-link{max-width:88px;font-size:11px}.mobile-toggle{margin-right:3px;flex-shrink:0}main{padding:24px 16px}.mode-options{grid-template-columns:1fr}.mode-card{padding:14px}.flash-controls{flex-wrap:wrap}.question-actions .btn{flex-grow:1}.application-case h2{font-size:18px}.application-graph{padding:10px}}
@media(max-width:650px){.sidebar.open~.workspace .mobile-toggle{position:fixed;left:265px;top:12px;z-index:40;background:#303337;border-color:#70747b}.two-col,.practice-layout,.form-grid,.field{min-width:0}select{width:100%}}
/* Academy: comfortable phone reading and one-tap study navigation. */
.brand{white-space:normal;font-size:14px;letter-spacing:1.5px}.brand em{display:block;font-size:20px;letter-spacing:2px;margin-top:3px}.mobile-brand,.mobile-dock{display:none}
@media(max-width:650px){
 body{font-size:16px}.topbar{position:sticky;top:0;z-index:25;height:72px;padding:10px 16px;background:#18191bf5;backdrop-filter:blur(12px);gap:12px}.topbar #breadcrumb,.topbar-link{display:none}.mobile-brand{display:block;text-decoration:none;font-size:10px;letter-spacing:1.6px;font-weight:700;line-height:1.5}.mobile-brand strong{display:block;color:#ee8288;font-size:15px;letter-spacing:2px}.mobile-toggle{min-height:44px;min-width:44px}.sidebar{padding:22px 18px 100px;max-height:100dvh}.sidebar .nav-link{min-height:46px;font-size:14px;padding:10px 12px}.sidebar.open~.workspace .mobile-toggle{top:14px;left:263px;font-size:0;width:44px}.sidebar.open~.workspace .mobile-toggle:after{content:'×';font-size:30px;line-height:1}.sidebar .brand em{display:inline;font-size:14px;letter-spacing:1.5px}.sidebar .brand{line-height:1.7}.sidebar-bottom{padding-top:20px}
 main{padding:25px 18px 32px;min-height:calc(100dvh - 160px)}h1{font-size:28px;letter-spacing:-.8px;line-height:1.25}.heading-row p{font-size:14px;line-height:1.65}.hero{padding:24px 20px;border-radius:16px}.hero h2{font-size:28px}.hero p{font-size:15px;line-height:1.7}.hero-actions{display:grid;gap:8px}.hero-actions .btn{width:100%;font-size:14px}.hero .text-btn{font-size:14px;min-height:44px}.panel,.flashcard{border-radius:14px}.btn{font-size:14px;min-height:46px;padding:12px 16px}.icon-button{min-width:44px;min-height:44px}.stat{padding:16px 13px;border-radius:12px}.stat-top,.stat small{font-size:12px}.stat-top{line-height:1.5}.stat-value{font-size:28px}.stat-icon{display:none}.domain-card{min-height:180px;border-radius:14px;padding:20px}.domain-card h3{font-size:17px}.domain-card .card-desc{font-size:14px}.card-meta,.weight{font-size:12px}.progress-track{height:5px}.section-head .inline-link{font-size:14px;min-height:40px;display:flex;align-items:center}.search-wrap input,input,select,textarea{font-size:16px;min-height:46px}.toolbar{gap:12px}.toolbar select{min-width:0;width:100%}.chip{min-height:44px;font-size:13px;padding:10px 13px}.lesson-row{padding:16px 12px;flex-wrap:wrap}.lesson-row a{flex-basis:calc(100% - 60px)}.lesson-row .task-id{order:-1}.lesson-row h3{font-size:16px;line-height:1.5}.lesson-row p{font-size:12px}.lesson-body p{font-size:16px;line-height:1.85}.lesson-aside p,.resources-grid p,.resources-grid li,.notice,.study-tip,.field label,.field-label{font-size:14px}.mode-card{font-size:15px;min-height:68px;padding:16px}.mode-card small{font-size:13px}.answer{font-size:16px;padding:16px 12px;align-items:flex-start;line-height:1.6}.question-title,.application-case h2{font-size:19px;line-height:1.65}.answer-letter{margin-top:2px}.question-actions{gap:12px}.feedback p,.feedback ul{font-size:15px}.application-graph summary{font-size:14px;min-height:44px;padding-top:12px}.flashcard p{font-size:16px}.flash-controls .btn{min-height:46px;font-size:14px}.mobile-dock{position:fixed;bottom:0;left:0;right:0;z-index:28;display:grid;grid-template-columns:repeat(4,1fr);gap:4px;padding:8px 10px max(8px,env(safe-area-inset-bottom));background:#18191bf5;backdrop-filter:blur(12px);border-top:1px solid #45474b}.mobile-dock a{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:48px;gap:2px;text-decoration:none;font-size:12px;color:#dedbd9;border-radius:8px}.mobile-dock a span{font-size:20px;color:#ee8288;line-height:1.2}.mobile-dock a:hover,.mobile-dock a:focus-visible{background:#342024}footer{padding:24px 18px 110px;font-size:12px;line-height:1.7}#toast{bottom:90px;width:max-content;max-width:calc(100% - 32px)}.back-link{font-size:14px;min-height:40px}.session-top{gap:12px;flex-wrap:wrap;font-size:14px}.session-container .panel{padding:20px 16px}
}
@media(max-width:359px){main{padding-left:14px;padding-right:14px}.hero{padding:22px 17px}.hero h2,h1{font-size:26px}.stats{gap:9px}.stat{padding:13px 11px}}
@media(max-width:650px){body:has(#nav a[href="#overview"].active) .mobile-dock a[href="#overview"],body:has(#nav a[href="#guide"].active) .mobile-dock a[href="#guide"],body:has(#nav a[href="#practice"].active) .mobile-dock a[href="#practice"],body:has(#nav a[href="#study-plan"].active) .mobile-dock a[href="#study-plan"]{background:#342024;color:#fff;box-shadow:inset 0 2px #d3484e}}
.deep-lesson{margin-top:34px;padding-top:28px;border-top:1px solid var(--line)}.deep-lesson h3{margin:24px 0 12px;font-size:19px}.deep-lesson li{margin:10px 0;line-height:1.8}.retrieval-check{padding:18px;background:#242629;border:1px solid #45474b;border-radius:10px}.retrieval-check summary{cursor:pointer;font-weight:700;min-height:28px}.retrieval-check p{margin-top:16px}.learning-coach{margin-top:26px}.learning-coach h2{margin:12px 0 16px}.coach-topic{border-top:1px solid var(--line);padding-top:22px;margin-top:22px}.coach-topic h3 a{color:var(--link)}.coach-topic li{margin:10px 0}.learning-coach details{margin-top:22px}.learning-coach summary{cursor:pointer;min-height:44px}.mock-clock-panel{background:#242629!important;color:#f5f2ef}.mock-status{color:#b9bbc0!important}.mock-session-panel .answer[aria-pressed=true]{background:#342024!important;border-color:#d3484e!important}.mock-jump{background:#222427!important;color:#ddd!important;border-color:#55585e!important}.mock-jump.answered{background:#293c33!important}.mock-jump.current{outline-color:#ff9297!important}.mock-jump.flagged{border-color:#e9be78!important}@media(max-width:650px){.deep-lesson h3{font-size:18px}.deep-lesson ul,.deep-lesson ol,.coach-topic ol{padding-left:20px}.deep-lesson li,.learning-coach p,.coach-topic li{font-size:16px;line-height:1.8}.deep-lesson small{font-size:13px}}
@media(max-width:650px){.learning-coach h2{font-size:22px}.coach-topic h3{line-height:1.5}.mock-note{font-size:14px!important}.mock-deadline{font-size:12px!important}.mock-tools .btn{font-size:14px!important}}

/* Bounded accessibility/reflow pass. Keep native disclosure markers and browser zoom. */
:root{--focus:#ffb5b8;--control-border:#81858c}
html{scroll-padding-block:90px 110px}
.workspace,main,.panel,.hero-copy,.session-container,.lesson-body,.two-col>* ,.practice-layout>*,.resources-grid>*,.stats>*,.form-grid>*,.answer>span:last-child{min-width:0}
main,footer,.sidebar{overflow-wrap:anywhere}
main img,main video,main svg{max-width:100%}
button,.btn,.chip,.icon-button,summary{min-height:44px}
.icon-button{min-width:44px}
button,.btn{white-space:normal;overflow-wrap:anywhere}
summary{cursor:pointer;padding-block:8px;line-height:1.6}
.retrieval-check summary,.learning-coach summary{min-height:44px}
/* Include native details, focusable scroll regions and the main skip target. */
:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
summary:focus-visible,.table-wrap:focus-visible,main:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
:where(button,a,input,select,textarea,summary,[tabindex]){scroll-margin-block:90px 110px}
input,select,textarea,.chip,.icon-button,.answer,.mode-card,.btn.secondary,.btn.ghost{border-color:var(--control-border)}
.answer.selected,.mode-card.active{border-color:#ee8288;box-shadow:inset 0 0 0 1px #ee8288}
.answer.correct{border-color:#89bf9c}.answer.wrong{border-color:#ed858b}
.check-label{min-height:44px;cursor:pointer}.check-label input{width:20px;height:20px;min-height:20px;flex-shrink:0}
.lesson-body a:not(.btn),.notice a,.feedback a,.coach-topic a{text-decoration:underline;text-underline-offset:3px}
.table-wrap{max-width:100%;overflow-x:auto;overscroll-behavior-inline:contain;-webkit-overflow-scrolling:touch}
th,td{overflow-wrap:normal;word-break:normal}
#toast{overflow-wrap:anywhere;max-width:calc(100vw - 32px)}
@media(max-width:650px){
 .sidebar{width:min(255px,calc(100vw - 64px))}
 .sidebar.open~.workspace .mobile-toggle{left:min(263px,calc(100vw - 56px))}
 .stats{grid-template-columns:repeat(2,minmax(0,1fr))}
 .form-grid,.two-col,.resources-grid,.practice-layout{grid-template-columns:minmax(0,1fr)}
 .topbar,.hero,.section-head,.question-actions,.flash-controls,.session-top{min-width:0}
 .hero-actions,.hero-actions .btn{min-width:0;max-width:100%}
 .lesson-row a{flex-basis:calc(100% - 60px)}
 .table-wrap{margin-inline:0}.table-wrap table{min-width:440px}
 .back-link,.lesson-nav a{padding-block:10px;min-height:44px}
 .mobile-dock{grid-template-columns:repeat(4,minmax(0,1fr))}
 .mobile-dock a{min-width:0;text-align:center}
}
/* On short landscape/zoomed viewports, avoid sandwiching content between fixed bars. */
@media(max-width:650px) and (max-height:450px){
 .topbar{position:static}.mobile-dock{position:static}footer{padding-bottom:24px}
 html{scroll-padding-block:12px}:where(button,a,input,select,textarea,summary,[tabindex]){scroll-margin-block:12px}
 #toast{bottom:12px}
}
@media(prefers-reduced-motion:reduce){
 *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
 .domain-card:hover{transform:none}
}
@media(forced-colors:active){
 :focus-visible{outline:3px solid Highlight!important}
 .btn,.chip,.answer,.icon-button,.mode-card,.mobile-dock a{border:1px solid ButtonText}
 .nav-link.active,.chip.selected,.mode-card.active,.answer.selected{outline:2px solid Highlight;outline-offset:-3px}
}
#reviewer-filter{display:grid;grid-template-columns:minmax(0,1fr);gap:12px;max-width:680px;margin-block:20px}#reviewer-filter label{font-weight:700}#reviewer-filter input,#reviewer-filter select{width:100%;min-width:0;min-height:48px;font-size:16px}.reviewer-item{margin-block:22px}.reviewer-item h2{font-size:22px}.reviewer-item li{margin-block:12px}.reviewer-item p{margin-block:14px}.reviewer-item ol{padding-left:24px}
/* Percentages respect the layout viewport when a desktop scrollbar is present. */
@media(max-width:650px){.sidebar{width:min(255px,calc(100% - 64px))}.sidebar.open~.workspace .mobile-toggle{left:min(263px,calc(100% - 56px))}}
#progress-restore-file{display:block;box-sizing:border-box;width:100%;max-width:100%;min-width:0;font-size:16px;padding:10px 0;margin-block:12px;white-space:normal}#progress-restore-file::file-selector-button{min-height:44px;max-width:100%;white-space:normal;border:1px solid #81858c;border-radius:6px;background:#222427;color:#f5f2ef;padding:8px 10px;margin-right:8px}#restore-notice{overflow-wrap:anywhere}
/* Remote mock: stable, readable controls at phone widths and enlarged text. */
#remote-status{margin-block:16px;line-height:1.7}
#remote-status .btn{margin:8px 8px 0 0}
.remote-mock-top{align-items:flex-start}
.remote-mock-top>div{min-width:0}
.remote-mock-top .mock-clock-panel{flex-shrink:0}
#remote-question{scroll-margin-top:92px}
#remote-jump-list{scroll-padding:8px;scrollbar-gutter:stable}
#remote-navigator summary{padding-block:12px}
.remote-question-actions .btn{min-width:110px}
@media(max-width:650px){
 .remote-mock-top{gap:8px}
 .remote-mock-top>div:first-child{flex:1 1 180px}
 .remote-mock-top .mock-clock-panel{display:flex;align-items:center;gap:12px;flex-wrap:wrap;width:100%;padding:12px 14px}
 .remote-mock-top .mock-clock-panel small{flex-basis:100%;font-size:12px}
 .remote-mock-top .mock-clock{margin-left:auto;font-size:24px}
 #remote-status{font-size:14px;padding:14px}
 #remote-status .btn{width:100%;margin:10px 0 0}
 .remote-question-actions{flex-wrap:nowrap;gap:10px}
 .remote-question-actions .btn{min-width:0;flex:1 1 0}
 #remote-jump-list{max-height:min(360px,50dvh)}
 .mock-tools .btn{min-width:0;max-width:100%;white-space:normal}
}
.workshop-exercise{margin-block:20px;padding:20px;border:1px solid #55585e;border-radius:12px;background:#202326;min-width:0}
.workshop-exercise label{display:block;margin:14px 0 6px;line-height:1.6;font-weight:600}
.workshop-exercise input{display:block;width:100%;max-width:360px;min-height:46px;font-size:16px;margin-bottom:12px}
.workshop-exercise button{min-height:46px;margin:4px 8px 4px 0;max-width:100%;white-space:normal}
.workshop-exercise [aria-live]{margin-top:14px;overflow-wrap:anywhere}
@media(max-width:650px){.workshop-exercise{padding:16px}.workshop-exercise input{max-width:100%}.workshop-exercise button{width:100%;margin-inline:0}.workshop-exercise p,.workshop-exercise label{font-size:16px}}

[hidden]{display:none!important}